高气压下交流旋转滑动弧放电特性实验研究

Experimental investigation of discharge characteristics of alternating current rotating gliding arc discharge under high air pressure

本文针对恶劣条件下滑动弧等离子体放电稳定性问题,搭建了高气压交流旋转滑动弧放电实验系统,开展了高气压下交流旋转滑动弧放电特性实验,并对其放电特性、电弧运动特性、光谱特性进行了分析.研究结果表明:随着介质气体压力的升高,滑动弧放电的电压、电流、能量均呈现增大趋势,当介质气体压力升高到0.52 MPa时,滑动弧放电的能量从常压下的84.74 J增大到147.13 J;且随着介质气体压力的升高,电弧的击穿频率并不是单调变化,而是在0.2 MPa时达到最大为26.55 kHz;高气压下电弧运动过程中会出现“弧道骤变”现象;随着介质气体压力的升高,滑动弧放电的整体光谱发射强度呈现变强趋势;通过两谱线法对滑动弧放电的电子激发温度进行了计算,常压下滑动弧放电的电子激发温度为0.8153 eV,随着介质气体压力的升高,电子激发温度呈现升高趋势,当介质气体压力达到0.4 MPa时,滑动弧放电的电子激发温度升高至5.3165 eV.

In order to study the stability of gliding arc plasma discharge under mal-conditions,an experimental system for studying the high air pressure alternating current rotating gliding arc discharge is built.The discharge characteristics,arc motion characteristics and spectral characteristics of rotating gliding arc discharge are analyzed under high pressure experimentally.Experimental results show that the voltage,current and energy increase in the gliding arc discharge with the increase of air pressure.As the air pressure rises to0.52 MPa,the discharge energy increases from 84.74 to 147.13 J.With the increase of gas pressure,the breakdown frequency of the arc does not change monotonically,but reaches a maximum value of 26.55 kHz at0.2 MPa,while the emission spectral intensity increases.The"arc channel mutation"occurs in the process of arc motion under high pressure.The electron excitation temperature in the process of gliding arc discharge is calculated by the two-line method,and the electron excitation temperature of gliding arc discharge is 0.8153 eV at an atmosphere pressure.The electron excitation temperature rises with the increase of air pressure.The excitation temperature increases to 5.3165 eV at an air pressure of 0.4 MPa.